In Where No One has gone before the Traveler tells Riker that his name is not pronouncable by humans.

Why didnt Riker just say "why dont you just say it for us then, so we know what it sounds like?"

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Maybe the proper pronunciation of the Traveler's name involves sounds that are out of the range of human hearing. Or maybe his name was a particular shade of infrared or ultraviolet that humans can't see. In either case, "pronouncing his name" would leave everyone no more informed about his name than just saying it is unpronounceable.

Isn't this a typical Sci-Fi trope? The alien's name who is unpronounceable to humans.

They did this with Spock in TOS as well. If I remember correctly, his Vulcan name is supposed to be unpronounceable. It seems they dropped that idea pretty quickly though. I'm surprised it survived to TNG.